THE ONLY WAY you'll ever lose fat and see your abs is if you eat fewer calories than you're eating now. Nothing else—not lifting weights, not cardio, not supplements—can offset failing to adhere to this simple rule. Period. So if you can put your pizza and beer day on hold for the next six weeks, read on, and we'll show you how to get a six-pack before summer is over.
It comes down to the calories
To lose fat, you have to burn more calories than you take in—but that doesn’t mean you can burn them with exercise. As Eric Ravussin, Ph.D., a weight-loss expert and professor at the Pennington Biomedical Research Center in Baton Rouge, LA, famously told The New York Times, “Exercise by itself is pretty useless for weight loss.” He ultimately made the point not only that people consume more calories than they can burn, but also that the extra strain of exercise stimulates appetite, making it even easier to replace the calories they’ve worked off.